To a large extent the diseases caused by the two viruses may be distinguished on the presenting clinical signs. See table summarising the main features of each condition and also including feline Chlamydia psittaci and Bordetella bronchiseptica infection as a differential diagnosis.

A number of factors can influence the outcome of infection and can make it more difficult to distinguish the cause of the disease.

There may be differences in virulence between virus strains and also the level of the infecting virus dose can affect the severity of the disease seen. The cat itself can influence the response, for example, with factors such as:

Confirming diagnosis

Interpreting results

Bacterial culture and sensitivity tests

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